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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b66806e2cae0c5b1221d3e2a8fcfc264abed322800364502a343a6bb31b11b' 
  AND token = 'tq3GKN0f+UH4wzu2o/+Au1wTWZwf8GJ+t93eQCFb6j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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