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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df154deb0c8b98b4313695e2610ad887f055967138d6685f8befbcd9b3d632dc' 
  AND token = 'YKLjdm/3H39LVcR8jddz8kIGGxlnEMh9oh/0AACh+MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}