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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba786831e011e77341a96062dc437f286f9bd43fb62c34ce8eb6c9514e7c52d1' 
  AND token = 'iXpypigVZpevaXQ2OPPn5UiPETK6S1i7QQx/G4+PmFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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