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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ae89ec5ab2e470d4b3547b3280e4485459296d62822dd59b263a78743fff35' 
  AND token = 'yu9S4AJ6F41sjrv/g+Ni+3nO0+O6hzLdys0twySC6GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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