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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0692112c687086ea2695c92963b19c83fd4fbdc78dfa7037caf5ca864941a051' 
  AND token = 'V1TnHGQXnLd/o5vUp1nOtN2SvP1EIY5h+bVuU1TC4uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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