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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9318361abbe0677dfb6e3d05b1b144f31d731d7befd42699274777d7e5c4db70' 
  AND token = 'SQrAujA4ayDJ+xiabOKGMxP+LE3CC5Rb3gh87/3aXtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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