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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bac4af46538fe95fa025d8d5380b2ba0489b03bbd95cf41e4583c40f770028' 
  AND token = 'OkCJSsSrkEiHTGaoU+cap0/gtN+sQJA+vtBLcHVBIpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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