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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd21c7651bfae8a4b2a1e3ab19319ffe40bf1510565b90c56b3364f7d84eb603' 
  AND token = 'oO1gybfh/Ttjc8fSrPB0UUCR9Qd1+o8Ni5sH8O2lCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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