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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119671ea785dfddc3a880a9ddda0354203c0a59c2cf25603d3209992e7d5f0ce' 
  AND token = 'VBMSRFV3rEhCYfKt2G/h1uy+GefBpmw8oZcsL3VdV9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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