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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95093cc31c345d6714439eedac5a8b95102860ce47652cb29b17fe0f33415994' 
  AND token = '2IZVvNQCBVc400Igtu0a7jA2cVSNUI6k32JV8FmbUTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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