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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a355df719d4f75b00e7c48e5a83f01fb2216f417a60f3afe7c326bdb614299eb' 
  AND token = '5i39/FxCFhy5hjPEiJn5JWnkJfi8RcrESvrHW3jCJXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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