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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6746ddcbb8695059098eb7c98cc732656ac52b7b1c1207d3eb9636de9b5ae842' 
  AND token = 'Kc1DNhhhwYo2HLTC4qcVULu1J38e1vlBh0x/V0BQ8iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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