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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d604a8ccabd6e29e58baec3338d1a6e8accb5c13624559f19342b0b88bdd61' 
  AND token = '0j54LBe2IkRBpeTL0U4sLr4F6XioRj5n2V98kga4D3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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