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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0bd78697a45482aa3a1794117c27d3bf5f2c8dffa067229307a31dfdb2c2eb' 
  AND token = 'N+v3mLAR81YntuVlGWdUraayAftXV+/iAr6Kx+Z6138=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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