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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3492e01c0fcc145326e4a0b205f810e3b75c9fb109e50d9f7b69a8b9b0dd36ab' 
  AND token = 'el9JgBH7bl3rprEOG4+++l3aGT1lpw/ipfFdD+Hc+Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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