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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e808b3f8ece192e8d4303e18cc2422f10e44bda4a785dad718755cb1061d60f' 
  AND token = 'bHk+iuKuZyV48bEJuDpo6ltxzIPIRrFbwApKg6686EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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