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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b3dde651930803336c46ac4c23af743984ca6d930edb295e10e68385bbd01d' 
  AND token = '4s/k+RniQESuw6vgNzwGnWYVO9dQLTP5Q4/u0i0H3EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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