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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf8dc12d751fcfc8453243efab540d4e2ace812e7749954d1e30c01e24b84c7' 
  AND token = 'RhB9NRCAOY3MHN809nFxn1i42x9e1R84+fPXJeWxlL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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