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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c37da9fd24304cde3a29489984854f7a789d2004d1228aebdba84d56384783a' 
  AND token = 'Ql6Rlb4y2s6HyEFbufw9958ib1Z4XlAr2VaEGyOvLG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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