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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa37dc1d556a5dabd95db221617fef9990c4e610236b5a35266bd00e6d490584' 
  AND token = 'fJYQKkk2LON8B2pUe1/Bbc4w875vsSO++t8uDESb7vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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