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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06355068fa75c02dcf4f2e60305ecd5fcb23bb902aa114f10f4b6d5d3e9caf6' 
  AND token = 'nmhR4F++OXq58AuVw8FrUOJZcXcK8f8OWS0gQqzRLME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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