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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e222dd6e525ceabdedbecdc9fc59523d0132f90056c686f1a29779ba2583b9e8' 
  AND token = 'aJ252NXfFNNHk962sD5mPdpuCtdU8SjrQ303/Jkc6F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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