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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c9a73e50347261fccce883fc21ce2fa9f3d721338bc3be5e5ee309693c565e' 
  AND token = '4cSWDgfLswkghwxmss/JX0aeJwAkue6HyA0Z/r+ABv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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