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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05dea4c1d483fa403b1bda451cb39365a5c8441b987527792a481712fb9a9de' 
  AND token = '7o3+CGr9PT/b+G+4dehKj34ClQ5JbzGW7LTHN9+wB1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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