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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afdcff84145aebbfeaa0758b7b4e187ee22b68f31c33ad8787f40ab3cc25aec' 
  AND token = 'ljxomeLiEgC6m3y1qOnMKhTK0nRmAmOwP3T7LDTmVjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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