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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9ea278235ca1310a0c3f77176a0d61a3371a68071fbd1c0cb1e68dd2b83c74' 
  AND token = '1BzfjJV4eq+dO9x9hLMhN6PpZ807XIFOlsA4g/emFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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