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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da445082e70199532d6a83dd6b8d895fac2702a8d486b22e38e5b8819917aa' 
  AND token = 'DNgqvayR0F0fOwyeBuil0IO1pbFwX/SX28RAI+rULhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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