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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfcf33101035dfbea0045039db60398a4fc6ef4fad022d797ed0f349eb7365c' 
  AND token = 'CSP0r77Ju8q4MaGy2K/+1bha0HLszaR9BUy1vaRtWLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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