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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936f49277a73fe901d25cda17662a3930027d60046668e1df1a4f293862fed3b' 
  AND token = 'EP/J+E5qY2X/HeZR1D8t43CQKSVkYK10K8Y23p6PBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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