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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6b78f8391122c57ad2e100fe7e3a2d63a72db6fb59eed60bb1fc793b032dbd' 
  AND token = 'H62Vg/g8lQPDPQb1N4lnxFpzYd0X1AvGiyugehidzDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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