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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c3407e6e29e6decc345cc8e40dc7398cdde131dc694258ab0e3caa5760001e' 
  AND token = 'HofsriL2LEteVcM+M1zg/Y3ErdyLMO44rINVIsXW3ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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