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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7855b5d93f3aca2e0e9a682e11c64c6d7c0c4b7df63f46e9c860bb80674a5032' 
  AND token = 'RNA+QAAyU3RYkrsuVsCIPLfMMv6eTmsaClvcwf27Smc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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