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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38c3444547ffbb5d5194686caec07db503fbeb717add5e590f41f5f3fb999e' 
  AND token = 'bz/aO2Ft+3y0jngiEMWL1N98AjXR2/qdnG1OS+GprCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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