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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7e9524c739c3e7044e6ececa71ade3d03a9235fcc5d7566f36f931a883d281' 
  AND token = 'BIOJHgLwr97+6HZGQLUB/LQPR1LGFQOefesGx161s+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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