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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7607888f46f17f88c9c8a0f713b3eea0c885df8d1443f2b48d5c6847906d9d98' 
  AND token = 'UjwXyhthYQjF8X5WTiO+TeFW3tPDr+VUwL39bb9w2Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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