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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e51ed6bf448a5985e255837237c699f1fa583731eddf7913d1aa2906d8b8440' 
  AND token = 'hP/CFJ17cEKmcM4zHvedpIyMTXkHmasdb+tK29ull3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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