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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbbbf63bec4cb72cda4717f265752ed31792e4b536eda9ef7937d783c7204c6' 
  AND token = '+a8p2h7sT2DNWF/vU47ezAwQC8zMEdIFCd4+aggOuvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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