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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4e4d30fbd8a3ed092189c0b70f2ce63c68a5190a22e13600cb402ea376bf4a' 
  AND token = 'wunsETYX/1nF0LGk8vbgxiI/Q+61V80XssuHnjQ0kD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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