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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ce41c69ce76358af64d2728506d533ac05dbc0b54f72bcb865b3ce3e55f8fd' 
  AND token = '09BkfWrj2Qsdx1+X6ScuQXBZ2Uy7BvJLal6Qh1ct+F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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