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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f3a2bc487d77370c333a5064f7f3bb626c6da21a9f851a61abd17c43de4fe3' 
  AND token = 'R+5mlquRrXjshsqQcfwPTcguO3Ud4rkL3TTnAQCynWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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