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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6660e2aafe03cf519bd5ae471cf0a8a7dd4d4f970cfc5b9872154f6e7f9ae12' 
  AND token = 'EN75YGZEekHDxOEiDk6KI8Dhw5XfY8/cQNG6rzbgp88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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