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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba4167a0993617ee6e37def60fae4cbc0f13be00d834436519e75970de39992' 
  AND token = 'ZcLEJ6KpmyARJgJ57cJkKYfV92E19D3+htb7hhh1a2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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