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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73888d1c15f9b737502b9e6d61748214e83b5e908dbc30e28eba7a4b5081a4d4' 
  AND token = 'cTTgBP+JkecdAnAgRuq7sg6UvOx9maviXHetJul8Kk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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