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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160f10f7d905a4f510406b194e7acaa508c7590be21a6708f207b4d23b357f07' 
  AND token = 'RyWDn3jeA4tlb0Z84TX2LMrU8B04ip5yNGiszJ2l3IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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