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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f891e1d2c0e935f10d310c831537627a22c6f015f89b24675b34f13340736be' 
  AND token = 'Sll9SUh1CiSft9c2i1vgUr1Sc0jbKKFHZIGb164l1fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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