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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7953e59647f7f2cdbb44c616b7b1a75e8c8bdc333c3ac0ce9084c45f763593' 
  AND token = '48zAIdvGXdfZa09jcGsWP2i39q3UnzfTxxPMpJXOQm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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