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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83e4fb179cb62f0b08ffb62e16dc9f50b9c36eb67ff2217db2bb496b05d5b10' 
  AND token = 'TVy+CKOFCZP6IT9VT68kiCQeJzjmbHoOwfWJrT4OKHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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