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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0411e109fce6bba8164432a026aedb4a9175068d667fc50ba58c2a529661ef5a' 
  AND token = 'TGxtK0rMldTaSvQlS8x2Cul3r0+UMXf8k0s6bbDFjcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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