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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6575fcb1c27af6bc1a4601f220c2ac057b0251ef891026d056d5a3033efca64f' 
  AND token = 'jFcj0o5Eay05Qk4sRZaeWQs7sB8g+6pv/5UzIM113AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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