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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724838ca8eb33649d0790f64189536280986320b43c6741d388887f32d628725' 
  AND token = 'B70rZfEeGuT+pe6HQ3quh5+Jl3RBieiuL4tk+dOnrqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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