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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfc023f627d7deff8a911d4ea48e77c81a158744a88b03d65bd509826915013' 
  AND token = 'wLN/MqqZg1YfZdWtj7Zd/v57edmY152nkXk3YCwbK0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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