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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4a5e4675e0ecfd23f5f47a7edf089f192b5a75b2e4b2d18f9477ff4dd67514' 
  AND token = 'AUfFilrKdzhkmH0eqiZsY45Zh3u4xki7OGLZLCtYAB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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