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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b05df14f8ee2db8e244f7ae1f83613f259c39e66eeca814a014a1efe9296d8' 
  AND token = 'R6+4TVhvU+ly4IgJ2Pddcq7R12ZhfyUUekJcj/+ibgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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