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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddf48527b0c2466533b857ecec57c5de54bc8a1638c02cffea53e39945d8c89' 
  AND token = 'nJkIchfRveMLV/SYWmI+hNZk4LFZE5cGKmJiyC4ytYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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