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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67176aa07519f2aad7a41677c7f4bac96a62fd4112f5c19cc55c8ce39d5a050' 
  AND token = 'p/847BCDasEsHX9opFQ7gy0SFsZ0wugdzVWxffUMya8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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