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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c86e299ddfd5cab2d441bae145688a272790e3040ad1ead66dc497beb92107' 
  AND token = 'IFPc6EJ89OL4kSfs6G8whjFou88S57XgaWi11Tpj0Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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