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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c69ff6d3d1c7b2887d557d2bdc9cdb3444a005c1eff6607dadc2a2e50dd06be' 
  AND token = 'jtc7wYX56Rfxm7anz8tA9gi32RqyN0wj/LQ3/MTgc54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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