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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2b23c0dda1b192ed026c351b841428eb2db56bd6a18a852221e37fedd265b7' 
  AND token = 'uvIo3LNJKwvnRGkxkEOT2gyTlVxO0nqSjlZgHMfF3YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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