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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cda6fb1c6bfc4366a807a24eb352d339ce6c616fa434d019dc4483b08eddb58' 
  AND token = 'AIWSF3dKzlZducYQ6N29GC5/rnQMf+rqQec4UclGGZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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