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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f243e80fa0b787d37bce3dc448f349c3b215404a90593e1674b52358b5935c8f' 
  AND token = 'H4S9XX6oUSqfHnBvSEQx2BS7BSCc4L6dRU4OUl4R3oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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