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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dd85ace2c5b1e8ab7a3eeb4d4a278a18a3465628f546d545aa7e0c6ae65c37' 
  AND token = 'ev582DT8vgqaCPR4R7jjH30gBaESTefas3SndQ2L4DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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